Surge Protection Devices Measurement & Control Phoenix Contact Surge Protection Devices for Measurement & Control Technology protect sensitive electronics against transients/surges due to parallel wiring in control cabinets. The Phoenix Contact Surge Protection Devices ensure excellent signal quality and reliable communication. Typical applications include process industry, water and wastewater, power and utility industry, and traffic signaling and transportation industry. All common signals are protected from analog and discrete signals to 2-wire through 6-wire technology such as temperature measurement or current loops.